Reference oscillator and its use

Details Reference oscillator and its use Reference oscillator and its use

2011-05-03

2011-05-03

Kinkead, Arnold (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S066000, C331S1160FE, C331S154000, C331S175000, C331S176000, C331S17700V

Reexamination Certificate

active

07936227

ABSTRACT:
A reference clock circuit (170), has a low-power mode, in which the frequency consumption is reduced, and including an internal counter, accumulating time spent in low-power mode. The circuit includes a crystal resonator (60), an oscillator circuit (70), and a temperature compensation circuit (80), providing a stable clock output (85). During low-power mode temperature compensation can be switched off. The circuit further provides a wakeup signal (107) after a preset time in low-power mode.

REFERENCES:
patent: 5845204 (1998-12-01), Chapman et al.
patent: 6873215 (2005-03-01), Devries et al.
patent: 7355482 (2008-04-01), Meltzer
patent: 2003/0098733 (2003-05-01), Saita
patent: 2003/0128157 (2003-07-01), Salkhi
patent: 2004/0122565 (2004-06-01), Sakurai et al.
patent: 2005/0007205 (2005-01-01), Bridger
patent: 2007/0090544 (2007-04-01), Northcutt
patent: 2008/0150797 (2008-06-01), Jia et al.
European Search Opinion—07109449, Search Authority—The Hague-Oct. 30, 2007.
European Search Report—07109449, Search Authority—The Hague-Oct. 30, 2007.

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